Scenedesmus quadricauda is freshwater algae which belongs to Scenedesmaceae family. This microalga has high biomass production and is widely used for biofuel production and wastewater treatment. The present study is an attempt to investigate, mass cultivation of S. quadricauda in different effluents of potato (Garnish), cattle farm (Goldasht Nemooneh Esfahan) and blasting materials (Nargostar Sepahan) with the aim of producing bio-oil and eva‎luating oil quality, determining fatty acid composition, amount of protein, as well as eva‎luating capability of S. quadricauda on reducing the load of organic and inorganic matters of different effluents. In the present research, 120- liter tanks were used and 95 liters of water and 5 liters from wastewater samples was used. The results showed that, the highest removal rate of nitrate, phosphate, ammonium, TAN, BOD and COD were obtained in cattle farm effluent by 71.6, 93.1, 76.41, 85.7, 92.1 and 84.8% respectively.The composition of fatty acids includes saturated fatty acids (SFAs), monounsaturated fatty acids (MUFAs) and polyunsaturated fatty acids (PUFAs), including C10: 0, C12: 0, C14: 0, C16: 0, C16 :1, C17: 0, C17: 1, C18: 0, C18: 1 trans, C18:1cis 9, C18: 2 cis, C18: 3, C20: 0, C20: 1. The amounts of SFAs, MUFAs and PUFAs were different in effluents of potato (26.6, 35.6 and 38.1%), cattle farm (27.8, 34.6 and 37.5%) and blasting materials (18.6, 42.6 and 38.7%), respectively. The highest amount of SFAs was observed in the biomass that cultivated in potato effluent, the highest amount of MUFAs and PUFAs were observed in the biomass cultivated in blasting materials effluent. Biomass that cultivated in cattle farm wasteweater has highest protein (38.11%) and lipid content (36.65%). The lowest proxide value (1.73 meq O2/Kg oil) and acid value (0.56 mg KOH/g oil) were observed in the oil from S. quadricauda which is cultivated in cattle farm effluent and in all examined three treatments proxide value was less than 2, and acid value was less than 1. it can be concluded that the cultivation of S. quadricauda with the examined effluents significantly reduces nitrogen, carbon and phosphorus and reduces the pollution load of the effluent and produces valuable biomass in terms of the composition of fatty acids as well as the type of lipid, which is widely used in nutrition and biofuels.

اميدوار فرهاديان

نصرالله محبوبي صوفياني

اميد بيرقدار كشكولي، حميد زيلويي